1. Find the product.3 × 8 A. 38 B. 11 C. 24 D. 5 Hint 2. Find the sum. A. 19,799 B. 19,769 C. 20,879 D. 15,145 Hint 3. Use mental multiplication. 3 × 400 A. 12,000 B. 1,200 C. 120 D. 3,400 Hint 4. Use mental multiplication.100 × 24 A. 24,000 B. 2,400 C. 240 D. 124 Hint 5. Tell which equation represents a way to find the product of 4 × 31. A. 4 × (31 − 1) B. 4 × (4 + 31) C. 4 × (30 − 1) D. 4 × (30 + 1) Hint 6. Find the product of 8 × 14 using mental math. A. 84 B. 94 C. 122 D. 112 Hint 7. Tell which equation is an estimate for A. 50 × 10 = 500 B. 50 × 20 = 1,000 C. 50 + 10 = 60 D. 60 × 10 = 600 Hint 8. An athlete exercises for 78 minutes every day. Tell which equation can be used to estimate how long the athlete exercises in one week. A. 80 × 7 = 560 B. 100 ×7 = 700 C. 80 + 7 = 87 D. 70 × 10 = 700 Hint 9. Find the product. A. 56 B. 159 C. 533 D. 169 Hint 10. Find 7 × 52. A. 59 B. 752 C. 354 D. 364 Hint 11. Find 78 × 23. A. 1,794 B. 7,823 C. 101 D. 1,424 Hint 12. As part of her training, an athlete runs 11 kilometers each day. How many kilometers does she run in 24 days? A. 2,640 km B. 242 km C. 64 km D. 264 km Hint 13. Identify the property.(6 × 9) × 15 = 6 × (9 × 15) A. Distributive Property B. Commutative Property C. Identity Property D. Associative Property Hint 14. Find the product mentally.5 × 13 × 200 A. 3,600 B. 13,000 C. 218 D. 513,200 Hint 15. Tell which equation is an estimate for 3 × \$5.05. A. 3 + \$5 = \$8 B. \$5 × 5 = \$25 C. 3 × \$5 = \$15 D. \$5 × 15 = \$75 Hint 16. Tell which equation is an estimate for 6 × \$7.89. A. 6 + \$8 = \$14 B. 6 × \$8 = \$48 C. 5 × \$5 = \$25 D. 10 × \$10 = \$100 Hint